Linq Matching Pattern

Question

I have to search a list of strings in CityList and if it contains all search strings then it should return true otherwise false.

When i search "London","Dallas" against CityList it should return false,because "Dallas" is missing in CityList.

var CityList=new string[] { "London","Paris","Houston","Mexico","Budapest"}

var search =new string[] {"London","Dallas"};

How to rewrite the following ?

var result =  CityList.Select(c => c).ToList().FindAll(search.ToArray());

Answer 1

Try the following:

var hasAll = !search.Except(CityList).Any();

By the way, you should never write something.Select(c => c); such a statement will do nothing but make the program a tiny bit slower.

Answer 2

That quite an easy one

search.All(c => CityList.Contains(c))

All will only satify when all predicates return true, then we check if the citylist contains the item

Answer 3

Try this:

var result = search.All(s => CityList.Contains(s));

Answer 4

You have various possibilities:

var result = CityList.Union(search).Count() == CityList.Count();
var result2 = search.All(s => CityList.Contains(s));
var result3 = search.ToList().TrueForAll(s => CityList.Contains(s));
var result4 = CityList.Intersect(search).Count() == search.Count();